Question

$1^{\circ },2^{\circ },3^{\circ }and{4}^{\circ }$ carbon atoms are present in

• A. 2, 3, 4 - Trimethylpentane
• B. 2, 2, 3 - Trimethylpentane
• C. both (a) and (b)
• D. Neither (a) nor (b)

Answer 1

The correct option is B

2, 2, 3 - Trimethylpentane

Let's draw the structure of the following compounds.

Now, what do you mean by $1^o,2^o,3^{o}and{4}^o$ carbons?
$1^o\to$ attached with only one carbon
$2^o\to$ attached with two carbons
$3^o\to$ attached with three carbons
$4^o\to$ attached with four carbons

Now, lets see the compound again.

$C_1\to 1^o{C}_2\to 3^o{C}_3\to 3^o{C}_4\to 3^o{C}_5\to 1^o$

$C_1\to 1^o{C}_2\to 4^o{C}_3\to 3^o{C}_4\to 2^o{C}_5\to 1^o$
Therefore, answer (b) is correct.